Update README.md

README.md

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 <h1>threlte-xr</h1>
 
+> **Warning**
+> `threlte-xr` has become part of the Threlte project. Use the [@threlte/xr](https://threlte.xyz/docs/reference/xr/getting-started) package. This package has been deprecated and archived.
+
 [![Version](https://img.shields.io/npm/v/threlte-xr?style=flat&colorA=000000&colorB=000000)](https://www.npmjs.com/package/threlte-xr)
 [![Downloads](https://img.shields.io/npm/dt/threlte-xr.svg?style=flat&colorA=000000&colorB=000000)](https://www.npmjs.com/package/threlte-xr)
 
 Svelte components and hooks for creating VR/AR applications with [threlte (v6)](https://next.threlte.xyz/), inspired by the design of [react-xr](https://github.com/pmndrs/react-xr).
 
-> **Warning**
-> `threlte-xr` is early in development. There will likely be frequent breaking changes until it reaches 0.1.0. It will only work with Threlte v6 onward.
-
 ```bash
 npm install threlte-xr
 ```